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It all comes down to absorption

Intramuscular injection bypasses this entirely, delivering B12 directly into the bloodstream via muscle tissue for near-complete bioavailability making it the gold standard for treating deficiency and supporting optimal B12 levels

Newer standards suggests that goals should emphasize functional, patient-reported outcomes

Methionine also aids in the synthesis of important molecules like proteins and other amino acids

Unlike vitamins A, D, E, and K which are stored in fat, B vitamins are water soluble and not stored in large quantities

Absorption Mechanisms and Biological Differences The absorption of vitamin B12 from tablets takes place mainly in the terminal ileum and relies on intrinsic factor, a glycoprotein synthesised by gastric parietal cells